Method of preparing aminodeoxyglycosidopurines



METHOD OF PREPARING AMINODEOXY- GLYCOSIDOPURINES Leon Goldman and Joseph W. Marsico, Nanuet, N. Y., assignors to American Cyanamid Company, New York, N. Y., a corporation of Maine No Drawing. Application October 31, 1955 Serial No. 544,085

23 Claims. 01. 260-2115 This invention relates to a novel method of preparing aminodeoxyglycosidopurines of the formula:

wherein R and R are members of the group consisting of halogen, hydrogen, alkyl, hydroxyl, alkoxy such as methoxy, ethoxy, propoxy, etc.;ara1kyloxy such as benzyloxy; mercapto, alkylmercapto such as methylmercapto, ethylmercapto, etc.; amino, alkylamino such as methylamino, ethylamino, decylamino, etc.; mononuclear arylamino such as p-methoxy phenylamino, etc.; aralkylamino such as benzylamino; heterocyclicalkylamino such as furfurylamino; dialkylamino such as dimethylamino, diethylamino, dipropylarnino, etc.; pentarnethyleneirnino such as piperidyl; oxapentamethyleneimino such as morpholinyl; dialkenylamino such as diallylamino and cycloalkylamino such as cyclohexylarnino, etc.; and wherein X is an aminodeoxyglycosido radical, the amino group of which is substituted by a member of the group consisting of hydrogen, acyl and aroyl radicals, and the exocyclic oxygen atoms of which are substituted by a member of the group consisting of hydrogen, acyl and aroyl radicals. The aminodeoxyglycosido radical may be a pentose or hexose, L or D, in either the furanose or pyranose form, and attached either ea or B to the 9-position of the purine with the amino or substituted amino group at any one of the available positions.

The aminodeoxyglycosidopurines as new compounds form the subject matter of the copending application of Baker et al., Serial No. 405,236, filed January 20, 1954, now abandoned in favor of a continuation-in-part application Serial No. 544,084, filed October 31, 1955. These new compounds are valuable therapeutic agents in the treatment of Trypanosomiasis, a disease caused by the presence in the body of a parasite of the genus Trypanosoma.

The preparative method for the novel compounds disclosed in the aforesaid copending application involves the condensation of a blocked derivative of a glycoside with a suitably substituted purine. Thus for example, 2,5-di- O-benzoyl-3-phthalimido-3-deoxy-;8-D-ribofuranosyl chloride may be condensed with 2 methylmercapto 6 dimethylaminopurine mercuric chloride reaction product in the presence of an inert hydrocarbon solvent to produce 2 methylmercapto 6 dimethylamine 9 (2,5-di-O- benzoyl 3 phthalimido 3 deoxy-fi-D-ribofuranosyl)- purine, the methylmercapto group of which may be removed by treatment with Raney nickel and the amino and hydroxy functions of which may then be unblocked to yield the free aminodeoxyglycosidopurine.

According to the present invention, we have now discovered a novel preparative method for these compounds which possesses considerable advantage over the only heretofore known preparative route in that following our procedure much more widely varying R and R substituted aminodeoxyglycosidopurines may be more conveniently prepared.

Briefly, the present invention involves utilizing as the starting material an aminodeoxyglycosidopurine which is substituted in the R and/or R positions by areplaceable group such as halogen, i. e. chlorine, bromine, etc. or alkoxy such as methoxy, ethoxy, etc. The so-substituted aminodeoxyglycosidopurine is reacted with a wide variety of nucleophilic reagents such as ammonia, various amines,

inorganic bases, etc.,which replace the halogen or alkoxy group by a suitable radical in the R and R positions such as hydroxyl, mercapto, alkylmercapto, amino, alkylamino, etc., as set out hereinbefore.

Thus for example, 6-chloro-9-(2,5-diO-benzoyl-3-acetamido-3-deoxy-[3-D-ribofuranosyl)purine may be reacted with dimethylamine in methanol to yield 6,-dimethy1- amino 9(3-acetamido-3-deoxy-B-D-ribofuranosyl) purine according to the following equation:

This product may then be deacylated.

This new preparative method possesses considerable ada certain degree the type of substituted aminodeoxy-,

glycosidopurine that can be prepared since the substituents on the purine must survive the rather rigorous condensation reaction, and the preponderant overall effect of the substituents must lead to the formation of a 9-substituted aminodeoxyglycosidopurine. The present method, however, obviates these diffic'ulties. By the new method no longer is it necessary to carry out separate condensation reactions for each variation desired in the final aminodeoxyglycosidopurine. In-

stead, by using halogen or alkoxy as a replaceable sub-.

stituent in either the 2'- or 6-positions, orboth, of an amlnodeoxyglycosidopurine, it is possible easily to replace the halogen or alkoxy by the final desiredsubstituent by reaction with an appropriate reagent.

As sources of the aminodeoxyglycosidopurines used as. starting materials in the preparative method of this inr vention, we may use any halogen or alkoxy substituted aminodeoxyglycosidopurines such as those disclosed inv the Baker et al. application referred'to, or we may usev any naturally occurring products.

The process of the present invention is preferably carried out by reacting a compound of the formula:

RTLNI l on N/ Thus in accordance with the method a CR x The above described replacementreaction,ispreferably.

carried out in a solvent such as anhydrous methanol at a temperature of from 20 to 200 0., although the solvent may be omitted if desired.

Following" the replacement reaction,,the aminodeoxyglycosidopurines may; be either selectively or fully deacylated, if necessary, by methods known to the art. That is to say, selective deacylation (retaining the acyl group on the sugar nitrogen) may be carried out in a solvent suchas ethanol or methanol in the presence of a base such as sodium methoxide. If full deacylation is desired, this may be acccmplished by the use of a strong base such as sodium hydroxide in thepresence of water, as a solvent.

It is also possible to carry out the deacylation reacfion as part of the replacement reactionasillustrated in several of the examples which follow.

The invention will bedescribed in greater detail in conjunctionv with thefollowing specific examples.

EXAMPLE. 1

6 chloro-chloromercuripurine and: bis(6-chlor0purinyl)- mercury 50ml. of 0.4 N sodium hydroxide was heated to 75 C. and 3.091 g, of '6-chlorpurine was added to produce a clear solution. A hot solution,,of'5.430 g. of. mercuric chloride in. 15 ml. of ethanol wasimmediately added, with stirring to produce colorless crystals. After chilling the crystals were removed by filtration, washed with water and dried overnight at 100 C. The yield. of light tau crystals, analyzing for 15% 6-ch1oro-chloromercuripurine andj85%' bis(6 chloropurinyl)mercury, was 96%.

EXAMPLE 2'- 6-chl0r0-9-(2,5 di-0-benzoyl 3 phthalimido-3-deoxyfi-D-ri b furanosyl purine To a stirred, refluxing suspension of 6.84 g. of a mixture of 82.5%" bis(6-chloropurinyl)mercury and 17.5% 6-chloro-chloromercuripurine in 350 ml. of anhydrous xylene, was added a hot solution of 11.86 g. of 2,5-di-O- benzoyl 3 phthalimido-3-deoXy-fi-D-ribofuranosyl chloride in 125 ml. of anhydrous xylene. The resulting suspension was refiuxed and stirred for 5 hours and then while hot filtered through Celite. The filter cake was washed with hot chloroformand the combined filtrate and wash were washed twicewith 40 ml. portions'of 30% potassium iodide and then with water. After drying over magnesium sulfate the solutionwas concentrated under reduced pressure to give 13.36 g. of 6-chloro9-(2,5-di-O- benzoyl-3-phthalimido-S-deoxy- D riboturanosyDpurine. Recrystallization from ethyl acetate-hexane gave 7.18 g. of colorless crystals of 6-chloro-9-(2,5-di-O-benzoyl-3- 4. phthalimido-S-deoxy-B-D-ribofuranosyl)purine (containing /2 mol of ethyl acetate), which sinters at 76-77 C. to an opaque glass, melts. at -105 C. to a clear glass; [aJ -60.9 (chloroform),

AQQQ 263 m (e12,100); Mini 263 mp. (610,700)

EXAMPLE. 3.

6-chl0r0-9-(2,5-di-0-benzoyl 3 acetamido-S-deoxy-D- ribofuranosyhpurine To a stirred mixture of 7.45 g. of 1-O-acetyl-2,5-di-O- benzoyl-3-acetamido-3-deoxy-D-ribofuranose and 5.85 g. of a mixture of 82.5% bis(6-chloropurinyl)mercury and 17.5% of 6-chloro-chloromercuripurine' in 325 ml. of anhydrous ethylene dichloride at room temperature, was added dropwise 2.32 ml. of titanium tetrachloride. The resulting suspension was stirred and refluxed for 20 hours. The stirred mixture was'chilled and 300 ml. of cold 0.1 N hydrochloric acid added in four portions- Stirring was continued for 15 minutes at room temperature and the mixture was filtered. The precipitate was washed well with hot chloroform. and the combined filtrate and washings were shaken well and thetlayers separated. The organic phase was washed with 60ml. of water, 60 ml. of 30% potassium iodide, and 60 m1. of water and dried over magnesium sulfate. The dried organic solution was evaporatedunder reduced pressure to' yield 7.77 g,- (85%) of 6-chloro-9-(2,5-di-O-benzoyl-3 acetamido-3- deoxy-D-ribofuranosyl)purine as a light tanglass; +392 (ethanol);

max;

methanol max.

263 my (e10,700);

EXAMPLE 4 6-dimethylamin0-9-(3-acetamido-3-de0xy-,B-D-

ribofuranosy l purine A mixture of 0.536 g. of 6-chloro-9-(2,S-O-benzoyl acetamido-3-deoxy-D-ribofuranosyl)purine (prepared as in Example 3), 1 ml. of dimethylarnine and 10 ml. of

anhydrous methanol was. heated in a sealed tube for. 2'

hours on a steam-bath. The resulting redrbrown solution was evaporated to dryness under reducedipressure and' the residual gum dissolved in aqueous ethanol and evaporated to dryness under reduced pressure. The residual gum was dissolved'in 40 m1. of50% methanol'and-38.4 ml. of the resulting solution'stirred with Amberlite IRA- 400 (OH) resin.- The resin was removed by filtration and the filtrate evaporated under reduced pressure to yield 0.304 g. (96 of 6-dimethylamino-9-(3'-acetamido-3-dcoxy-D-ribofuranosyl)purine as a tan glass. Grystallizaticin from 3A alcohol gave 0.165 g (52%) 'of' colorless crystals, M. P. 186-189' CL, of 6 dimethylamino 9 (3-acetamido 3 deoxy-fl-D-ribofuranosyl)purine;- [fl -8.1

Aethnnd max.

3-acetamido-3-deoxy-Drribofuranosyl)purine (preparedas in, Example 3), 7.2 ml. of diethylamine-and35 ml. of

anhydrousmethanohwas'heated. inn-sealed tube for 2 hours t on ,a steam-bath. The. resulting dark. redsolution.

was evaporated. to dryness under reduced pressureand the residue was; evaporated, to dryness under reduced pressure several. times: with aqueous ethanol. The dark brown;:crystalline residuerwas: dissolveclir'r ml..of

50% methanol and. the resulting; solution stirred. with Amhe-rli-te IRA-40.0 (OH) resin; The resinwas removed by filtration. and-ithe -.filtrate. evaporated. to dryness sunder' reduced.pressure'to ryield;;1.944- g.;..(.78%'),, of 6-diethyl-.

amino-9-(3-acetamido-3-deoxy D-ribofuranosyl)purine as a brown solid, M. P. 180192 C. Recrystallization from new 269 ml- 277-5 (519,400); A3115 MR 278 m 619,800)

EXAMPLE 6 6-diethylamin0-9-(3-amino-3-deoxy-fl-D- ribofuranosyl) purine A solution of 0.500 g. of 6-diethylamino-9-(S-acetamide-3-deoxy- 8-D-ribofuranosyl)purine (prepared as in example 5) in 50 ml. of 5% barium hydroxide was heated on a steam-bath for 1 hour. Excess carbon dioxide was added and the precipitated barium carbonate removed by filtration. The filtrate was evaporated to dryness under reduced pressure and the crystalline residue was dissolved in 15 ml. of 50% methanol. This solution was passed through a column of g. of Amberlite IRC-50 (H) resin and the column washed with four 100-ml. portions of 50% methanol; the last eluate having negligible absorption at 277.5 III/L. The combined eluates were evaporated to dryness under reduced pressure to yield 0.287 g. of recovered starting material. The resin column was washed with two 100-ml. and two SO-ml. portions of 1:1 methanol: 0.6 N ammonium hydroxide, the last eluate having negligible absorption at 275 m The combined eluates were evaporated to dryness under reduced pressure to yield 0.133 g. (30%) of 6-diethylamino-9-(3- amino-3-deoxy-fi-D-ribofuranosyl)purine as tan crystals, M. P. l65-175 C. The recovered starting material was hydrolyzed with 5% barium hydroxide as above to yield an additional 0.085 g. (19%) of 6-diethylamino-9-(3- amino-3-deoxy-,8-D-ribofuranosyl)purine as buff-colored crystals, M. P. 176180 C. Twenty percent of the starting material was recovered. The product was recrystalized from 1:1 ethyl acetatezethanol with the aid of Norit to yield colorless crystals, M. P. 18ll83 C.; [cc] 45.8 (ethanol) R232 RC1 268 my (619,700), RE 277.5 mp (20,000)

EXAMPLE 7 d-methylamino-Q- (3-amino-3-deoxy- 8-D- ribofuranosyl purine A mixture of 6.68 g. of 6-chloro-9-(2,5-di-O-benzoyl-3- phthalirnido-3-deoxy-B-D-ribofuranosyl)purine (containing one-half mole of ethyl acetate and prepared as in Example 2), 4 g. of methylamine and 85 ml. of anhydrous methanol was heated in a sealed tube for 4 hours on a steam-bath. The resulting solution was chilled and filtered to remove colorless crystals which were washed with water and ether and air-dried. The yield of 6- methylamino-9-(3-amino-3-deoxy-B D ribofuranosyl) purine as colorless crystals, M. P. 228-231 C. was 1.016 g. The combined filtrate and washings were evaporated under reduced pressure and the residue evaporated several times under reduced pressure with aqueous ethanol. A solution of the residual amber gum in 50% methanol was stirred with Amberlite IRA-400 (OH) resin for one-half hour. The resin was removed by filtration and the filtrate was evaporated to dryness under reduced pressure. The residue was crystallized from absolute ethanol to yield 1.109 g. of 6-methylamino-9-(3-amino-3-deoxy-B-D-ribofuranosyl)purine as colorless crystals, M. P. 224-230 C. Concentration of the the mother liquor afforded an additional 0.226 g. of product, M. P. 195212 C. giving a total yield of 2.351 g. (84%). When recrystallized from atl-anal max.

aqueous ethanol colorless crystals were obtained, M. P. 2285-2305" C.; [a] 29.6 (water);

g zeas m 617,600 267.5 ma 616. ggy NM 267.5 mu

EXAMPLE 8 6 -isob uty lamin0-9- (3 -aminc-3-deoxy-,B-D-ribofuranosyl purine A mixture of 4.29 g. of 6-chloro-9-(2,5-di-O-benzoyl-3- phthalimido-3 deoxy- 8-D-ribofuranosyl)purine (containing one-fourth mole of ethyl acetate and prepared as in Example 2), 7.00 ml. of isobutylamine and 60 ml. of anhydrous methanol in a sealed tube was heated on a steambath for 6 hours. The resulting amber solution was evaporated to dryness under reduced pressure and'theresidue evaporated several times under reduced pressure with aqueous ethanol. The residue was treated with '20 ml. of 1:1 ethanolzwater and filtered. The filtrate was stirred for 1 hour with 10 g. of Amberlite IRA-400 (OH) resin and then evaporated to dryness under reduced pressure and the crystalline residue evaporated several times under reduced pressure with absolute ethanol to yield 2.889 g. of tan crystalline residue. The residue was washed well with water and the water wash was evaporated to dryness under reduced pressure to a crystalline residue which was recrystallized from absolute ethanol to yield 0.953 g. of 6-isobutylamino-9-(3-amino 3 deoxy-B-D-ribofuranosyl) purine as colorless small plates, M. P. l72173.2 C. The mother liquor yielded a further crop of crystals, giving a total of 1.200 g. (56%). Recrystallization from absolute ethanol produced colorless crystals, M. P. 171.5- 172.5 C. [a] 25.3 (water);

76,252 263.5 m (619,000); ML 268 mu (17,700); in}? 217 mp (11,000), 268.5 mp. (18,000)

EXAMPLE 9 6-dimethylamin0-9- (3-amin0-3-de0xy-fi-D-ribofuranosyl) purine A mixture of 0.969 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido-3-deoxy-fi-D-ribofuranosyl)purine (containing one-half mole of ethyl acetate and prepared as in Example 2), 1.0 ml. of dimethylamine and 5 ml. of anhydrous methanol in a sealed tube was heated on a steambath for 6 hours. The tube was cooled and opened and 2.1 ml. of an anhydrous methanol solution of 0.24 g. of methylamine was added. The tube was resealed and heated on a steam-bath for 6 hours. Chilling produced nearly colorless crystals which were collected by centrifugation, washed with methanol, and dried under reduced pressure. The product, 0.368 g., M. P. 205-207 C., was recrystallized from absolute ethanol to give 0.258 g. of colorless crystals of 6-dirnethylamino-9-(3-amino-3-deoxy- 8-D-ribofuranosyl)purine, M. P. 214-216 C.

EXAMPLE l0 6-(] -piperidyl)-9-(3- [o -(1 -piperidylcarbonyl)benzamia0] 3-de0xy- 8-D-ribofuranosyl) purine A mixture of 6.68 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido-3-deoxy-fi-D-ribofuranosyl)purine (containing one-fourth mole of ethyl acetate and prepared as in Example 2), 12.9 ml. of piperidine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steambath for 6 hours. The resulting amber solution'was evaporated under reduced pressure and the residual crystals and gum were evaporated under reduced pressure several times with aqueous ethanol, and finally with absolute ethanol. A solution in ml. of 60% ethanol of the residue was stirred for 2 hours with 20 g. of Amberlite IRC-400 (OH) resin and the filtrate was evaporated to dryness under reduced pressure to yield a tanglass. The glass was triturated with ether and dried at 70 C. (0.01 mm.) to yield 3.609 g. (61%) of crude 6-(1-pip'eridyl)-9- I (3-[o-(1-piperidylcarbonyl)benzamido] 3 deoxy fl D- ribofuranosyl)purine;

13 :5 H01 272.5 m (618,100 new MR 280 m .19,200)

EXAMPLE l1 A solution of 3.556 g. of 6-(1-piperidyl)-9-(3-[o-(lpiperidylcarbonyl)benzamido1 -3 -de0xy-j8-D-ribofuranosyl) purine (prepared as in Example 10) and 1.026 g. of methylamine in 39 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 6 hours. The cooled reaction mixture was filtered, removing 1.077 g. of 6-(1- piperidyl)-9-(3-amino-3-deoxy-fi-D-ribofuranosyl)purine as colorless shiny small prisms, M. P. 189-191" C. Concentration of the mother liquor yielded an additional 0.244 g. of product, M. P. 188-191 C., giving a total yield of 61%.

Recrystallization from methanol yielded colorless crystals, M. P. 189.5-190 C., of the hemihydrate, [12], -44.0 (ethanol);

)g g 272.5 111,. 621,400 280 my 622,500) 535:. .22,400

max.

m 217.5 m 10,400 210.5 m (625,200 281 m EtOH EXAMPLE 12 6-dipropylaminm9-(3-amin0-3-deoxy-B-D-ribofuranosyl) purine A mixture of 6.68 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3- phthalimido-3-deoxy-fi-D-ribofuranosyl)purine (containing one-half mole of ethyl acetate and prepared as in Example 2), 13.8 ml. of dipropylamine and 60 ml. of anhydrous methanol in a sealed tube was heated on a steambath for 6 hours. The tube was cooled and opened and ml. of an anhydrous methanol solution of 1.71 g. of methylamine was added. The tube was rescaled and heated on a steam-bath for 6 hours. The resulting light tan solution was evaporated to dryness under reduced pressure, and the residue was evaporated to dryness under reduced pressure with aqueous ethanol. The residue was triturated with 300 ml. of 5:1 methanolzwater, chilled and filtered. The filtrate was stirred for 1 hour with 15 g. of Amberlite IRA-400 (OH) resin and then evaporated to dryness under reduced pressure. The residue was triturated with methanol, chilled, filtered and washed with ethyl acetate to yield 1.093 g. of 6-dipropylamino-9-(3- amino-3-deoxy-p-D-ribofuranosyl)purine as colorless shiny plates, M. P. 168-1695 C. Recrystallization from ethyl acetate yielded lustrous colorless plates, M. P. 168.5- 1.69.5 C.; [a] 45.0 (methanol);

my m 270 m (.20,000 x2532 215 m (615,500 277.5 111,. .20400); AQLENOE 217.5 m (27,600), 280 m). (.20,500)

EXAMPLE 13 Bis(2,6-dichl0ropurinyl) mercury To a solution of 37.7 ml. of l N sodium hydroxide and 100 ml. of water at 75 C., 7.14 g. of 2,6-dichloropurine was added rapidly with stirring. Then a hot solution of 10.24 g. of mercuric chloride in 30 ml. of ethanol was immediately added and the slurry rapidly chilled. The tan crystals were removed by filtration, washed with water and dried at 100 C. The yield of bis(2,6-dichloropurinyDmercury was 11.41 g.

EXAMPLE 14 2,6 -dichlor0-9- (2 ,5 -di-O-benzoyl-S-phthalimido- 3 -deoxy-D-ribo;furanosyl purine To a stirred, refluxing suspension of 6.50 g. of bis (2,6-dichloropurinyl)mercury (prepared as in Example 13) in 100 ml. of xylene, a hot solution of 9.10 g. of

2,5 di O benzoyl 3 phthalimido 3-deoxy p- D-ribofuranosyl chloride in ml. of anhydrous xylene was added. The mixture was refluxed for 5 hours and filtered while hot. The small amount of precipitate was washed with hot chloroform and the combined filtrate and washings were cooled and washed with 30% potassium iodide and with water and dried over anhydrous magnesium sulfate. Evaporation under reduced pressure yielded 12.0 g. of 2,6-dichloro-9-(2,5-di-O-benzoyl-3- phthalimido-3-deoxy-D-ribofuranosyl)purine as a nearly colorless glass.

Crystallization from ethyl acetate-hexane yielded 6.51 g. (55%) of 2,6 dichloro 9 (2,5 di O benzoyl- 3 phthalimido 3 deoxy D ribofuranosyl)purine as colorless crystals, which sintered at 58-60 C. to an opaque glass and melted at -105 C. to a clear glass; [u] -57.0 (chloroform);

iggg 270 m, (e11,400 ma 275 u may ME 260 mp 59,360 207.5 mp (8,910)

EXAMPLE 15 6-methylamino-9- (3-acetamido-3-deoxy-u and B-D-ribofuranosyl) purine A mixture of 5.708 g. of 6-chloro-9-(2,5-di-O-benzoyl- S-acetamido 3 deoxy-D-ribofuranosyl)purine (prepared as in Example 3), 3.35 g. of methylamine and 44 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 2 hours. The dark red-brown solution was evaporated under reduced pressure and the residue was twice evaporated to dryness with water under reduced pressure. A solution of the residue in ml. of 1:1 methanolzwater was stirred for 1 hour with 15 g. of Amberlite IRA-400 (OH) resin and the filtered solution was evaporated to dryness under reduced pressure. The residue was evaporated to dryness several times with absolute ethanol under reduced pressure. The residue, 4.71 g., was crystallized from methanol to yield in two crops 0.869 g. of nearly colorless crystals, M. P. 210- 219 C. Recrystallization from methanol yielded 0.145 g. of G-methylamino 9 (3 acetamido 3 deoxyu D ribofuranosyl) purine as a colorless crystals, M. P. 250-255" C. (dec.). The combined methanol filtrates were evaporated to dryness under reduced pressure to yield a gummy residue which was partitioned on g. of Celite in the system 5:1:1 chloroformzmethanol: water; the column was eluted with the lower phase and thirty-four 10 ml. portions of eluate were collected. The column was then eluted with the lower phase of the system 5:2:1 chloroform2methanolzwater, thirty-eight 10 ml. portions of eluate being collected; the column was finally eluted with methanol, a 176 ml. andttwenty-two 10 ml. portions of eluate being collected. Combined eluates 34-64 were evaporated to dryness under reduced pressure to give 0.886 g. (26%) of tan crystals of 6- methylamino 9 (3 acetamido 3 deoxy 8 D ribofuranosyl)purine. When recrystallized several times from methanol, colorless crystals (containing one-fourth mole of water) were obtained, M. P. 229-230 C. (dec.); [a'l 2.0 (water);

A3,? 262.5 mu (618,000); A2 12 266 mp. (e17,000)

x3e: 265 m (610,700

9515 RC1 m mu x3 12 9 265 my (6171300) water m!!- EXAMPLE 16 A solution of 8.11 g. of 82.3% 6-methylamino-9-(3-' acetamido-3-deoxy-D-ribofuranosyl)purine (prepared as in Example 15) in 150 ml. of saturated aqueous barium hydroxide was heated on a steam-bath for 1 hour. Excess carbon dioxide was added and the precipitated barium carbonate was removed by filtration. The filtrate was evaporated to dryness under reduced pressure and the residue was dissolved in 200 ml. of absolute ethanol, filtered to remove a precipitate, and evaporated to dryness under reduced pressure to yield a residual brown glass.

Column I.A solution of the glassy residue in 30 ml. of 1:1 methanolzwater was percolated through a column of Amberlite IRC-50 (H) resin and the resin column was washed with 800 ml. of 1:1 methanohwater, the final eluate showing negligible absorption at 275 mu. The column was washed with 600 ml. of 1:1 methanol:0.6 N ammonium hydroxide, the final eluate showing negligible absorption at 277 m Evaporation to dryness under reduced pressure of the methanol:0.6 N ammonium hydroxide eluate yielded 0.791 g. of residual crystals and lass. g Column II.-The 0.791 g. of residue from column I was partitioned on 26 g. of Celite in the system 20:1:4 ethyl acetatezmethanolzwater and the column successively washed with 80 mil., 70 ml. and 80 ml. of the upper phases of the systems 20:1:4, 101112 and 20:3:4 ethyl acetatezmethanolzwater. The column was finally washed with methanol to elute two tan-colored bands. Evaporation of the methanol eluate yielded 0.489 g. of residue.

Column III.-The 0.489 g. of residue from column II was partitioned on 22 g. of Celite in the system :2:1 chloroformzmethanolzwater and the column was eluted with lower phase; eighteen 3.6 ml. portions of eluate were collected and evaporated to dryness. Eluates 8-18, containing a total of 0.235 g. of nearly colorless crystals, were combined and recrystallized from absolute ethanol to yield, in two crops, 0.178 g. (3%) of nearly colorless crystals of 6-methylarnino-9-(3-amino-3-deoxy-B-D-r1bofuranosyl)purine, M. P. 227229 C. Recrystallization from absolute ethanol, with the aid of Norit, yielded colorless crystals, M. P. 230-231 C.; [a] 26.9 (water);

266 mu (e16,200);

The methanolzwater eluate of column I was evaporated to dryness under reduced pressure to yield 4.71 g. of a glassy residue which was rehydrolyzed with barium hydroxide as above.

Column I V.The rehydrolysis product was partitioned on 115 g. of Celite in the system 5:2:1 chloroform: methanolzwater, using lower phase to elute the column, and forty-five ml. portions of eluate were collected. Combined eluates -32 were evaporated to dryness to yield 1.157 g. of crystalline residue which was recrystallized several times from absolute ethanol to yield 0.063 g. (1%) of colorless crystals of 6-methylamino-9- (3-amino-3-deoxy-[3-D-ribofuranosyl)purine, M. P. 228- 230 C.

Column V.Combined eluates 8-18 of column IV were evaporated to dryness to yield 0.771 g. of residue which Was partitioned on 28 g. of Celite in the system 6:4:1 butanolzwaterzacetic acid and the column was eluted with upper phase; twenty-two 2 ml. portions of eluate were collected. Combined eluates 6-16 were evaporated to dryness to yield 0.528 g. of residue which was crystallized from methanol to yield colorless crystals, M. P. 229-230" C., of recovered 6-methylamino-9- (3-acetamido-3-deoxy- 3-D-ribofuranosyl)purine hemihydrate.

10' EXAMPLE 17 6-diethylamin0-9- (3-amina-3-deoxy-B-D-rihofurdnosyl) purine A mixture of 1.000 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3 phthalimido 3 deoxy fl D ribofuranosyDpurine (containing one-third mole of ethyl acetate), 1.18 ml. of diethylamine and 25 ml. of anhydrous methanol was refluxed for 3 hours. Butylamine, 1 ml., was added and the resulting solution was refluxed for 3 hours. The cooled solution was stirred for 45 minutes with 5 g. of Amberlite IRA-400 (OH) resin and the filtered solution was evaporated to dryness under reduced pressure. The light tan residual solid was crystallized from 3A alcohol to yield colorless crystals of 6-diethylamino-9-(3-amino- 3-deoxy-fl-D-ribofuranosyl)purine which after washing with ethyl acetate and ether weighed 0.133 g. and had. M. P. 179.5181.5 C. The mother liquor was evapo-- rated to dryness and the residue was washed with ethyl-- acetate and ether to yield an additional 0.106 g. of product as colorless crystals, M. P. 179.5181 C. Thecom-- bined crops were recrystallized from absolute ethanol and then from ethyl acetate-absolute ethanol to yield colorless crystals, M. P. 181.5182.5 C.; [a] -44.0' (ethanol); kflfif 268 mu (e18,200); A32? 276.5 mu (e18,800);'

g g 277 mu EXAMPLE 18 6-dibutylamino-9-(3-amin0-3-deoxy-fl-D-ribo;furanosyl) purine A mixture of 6.50 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido-3-deoxy ,3 D-ribofuranosyl)purine (containing one-third mole of ethyl acetate), 9.7 g. of dibutylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 1% hours. The cooled tube was opened, 5 ml. of butylamine was added, and the tube was resealed and heated on a steam-bath for 1% hours. The resulting amber solution was evaporated to dryness under reduced pressure and the crystalline residue was twice evaporated to dryness under reduced pressure with absolute ethanol. Recrystallization of the residuefrom absolute ethanol gave 1.144 g. of 6-dibutylamino-9- 3-amino-3 -deoxy-fi-D-ribofuranosyl) purine as colorless small plates, M. P. 189.5-190.5 C. The mother liquor was concentrated to a volume of m1., diluted with 20 ml. of water, and the resulting solution stirred for 45 minutes with 25 g. of Amberlite IRA-400 (OH) resin. The filtered solution was evaporated under reduced pressure to a crystalline residue which was slurried with absolute ethanol and evaporated to dryness under reduced pressure. Recrystallization from absolute ethanol gave, in four crops, 1.067 g. of product as colorless.

small plates, M. P. 1845- C. The combined crops were recrystallized from 3A alcohol to yield colorless crystals, M. P. 189.5-190.5 C.; [alg -388 (methanol);

55 271 mu (619,200); tg NIOH 280 m (619,600)

EXAMPLE 19 6-jurfurylam in0-9- 3 -amin0-3-de0xy-fl-D-ribofuranasyl purine SS-21111101 m which in 9.9 ml. of butylamine and 25 ml. of anhydrous methanol was refluxed for 4% hours. The resulting brown solution was evaporated to residue under reduced pressure. A solution of the residue in 80 ml. of 80% ethanol was stirred for 1 hour with 20 g. of Amberlite IRA:400 (OH). resin. The'filtered solution wasevaporated to dryness under reduced pressure and the residual gum was evaporated under reduced pressure several times with absolute ethanol. The residue, consisting of brown crystals and gum, was crystallized from absolute ethanol to yield 0.814 g. of- 6-furfurylamino-9-(3-amino-3-deoxyfl-D-ribofuranosyDpurine as nearly colorless crystals, M. P. 153 C. (gas). Recrystallization from 3A alcohol and then from ethyl acetate-absolute ethanol gave colorless crystals, M. P. 157.5-158.5 C.; [a] 43.5 (water);

MEL}? 264 m (e17,900); A33? 267.5 m (618,400); 1123f 268 mu (e19,200)

EXAMPLE 20 6-benzylamino-9- (3-amino-3-deoxy-B-D-rib0furanosyl) purine A mixture of 6.685;. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido 3 deoxy-fi-D-ribofuranosyl)purine (containing one-half mole of ethyl acetate), 10.9 ml. of henzylarrline and 65 ml. of anhydrous methanol in' a sealed tube'was'heated on a steam-bath for '2 hours. The resulting solution was evaporated under reduced pressure to a residual gum, a solution of which in 240 ml. of methanol and 60 ml. of water was stirred for 1 hour with 20 g. of Amberlite IRA-400 (OH) resin. The filtered solution was evaporated under reducedv pressure to a crystalline residue which was. treated with absolute ethanol and filtered. The filtrate was evaporated under reduced pressure to a syrup which was crystallized from ethyl acetateether to yield 2.695 g. of nearly colorless crystals, M. P. 150-165 C. Several recrystallizations from absolute ethanol gave 6.benzylamino-9-(3-amino-3-deoxy-fi-D- ribofuranosyl)purine as colorless crystals, M. P. 1743 175.5 C.; [a] -41.8 (methanol);

was 264 u ne 270 m 620,600 tgg: NM 270 mu (621,200

EXAMPLE 21 6-.methoxy-9-(3-1211tlzalimido-3-deoxy-fl-D-rib0fumnosyl) purine A solution of 2.00 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3 phthalimido-3-deoxy-,8-D-ribofuranosyi)purine (containing one-third mole of ethyl acetate), 5 ml. of chloroform, 7.25 ml. of anhydrous methanol and 9.24 ml. of 1 N methanolic sodium methoxide was refluxed for 2 hours. The reaction mixture was then evaporated to dryness under reduced pressure. A suspension of the residue in 20 ml. of dimethylformarnide and 0.438 ml. of glacial acetic acid was refluxed for-l hour, cooled and filtered, and the filtrate was evaporated to dryness under reduced pressure. The residual tan crystals were washed with ethyl acetate and water to yield 0.749 g. of 6-methoxy- 9-(3-phthalimido-3-deoxy-p-D-ribofuranosyl)purine as tan crystals, M. P. 22923l C. (dec.). Repeated recrystallization from aqueous ethanol (with the aid of activated charcoal) gave colorless crystals, M. P. 243-244 (dec.); [a] 1l3.0 (methanol);

up: He 222.5 m eazsoo 242.5 mp. 618,000); A$ 220 my 635,100), 24.2.5 mu (518,100); isgf 217.5 mp 625,200 247.5 my 615,500

EXAMPLE 22 A mixture of 6.504 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3 phthalimidoa3-deoxy- 8-D-ribofuranosyl)purine (containing onesthird mole of ethyl acetate), 11.8 g.- of-i-d-iamylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on'a'steam-bath for 1% hours. The

cooled tube was opened, 5 ml. of butylamine was added, and the tube was rescaled and heated on a steam-bath for 2 hours. The resulting solution was evaporated to dryness under reduced pressure and the residue evaporated to dryness under reduced pressure twice with aqueous ethanol and once with absolute ethanol. Recrystallization of the residue from absolute ethanol gave 1.683 g. of 6-diamylamino-9-(3-amino 3 deoxy-fl-D-ribofuranosyl)purineas colorless crystals, M. P. 171-1725 C. The mother liquor was diluted with ethanol to ml., 20 ml. of water was added, and the resulting solution was stirred for 1 hour with 20 g. of Amberlite IRA400 (OH) resin. The filtered solution was evaporated to dryness under reduced pressure and the residue was triturated with ether to yield an additional 0.473 g. of product as colorless crystals, M. P. l64167 C. The combined crops were recrystallized several times from absolute ethanol to yield colorless crystals, M. P. 172-- 173.2 C.; [a] 43.7 (ethanol);

3212 271 m (e20,000); )rggt 279 mu (0,600); ax f 280 my ((520,400)

EXAMPLE 23 6-diheptylamin0-9-(3-amin0-3-de0xy-fl-D-ribofurauosyl) purine Amixture of 3.74 g. of 6-chloro9-(2,5-di-O-benzoyl- 3-phthalimido3:deoxy-fi-D-ribofuranosyl)purine (contain ing one-half mole of ethyl acetate), 9.00 g. of diheptylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 2% hours. The cooledtube was opened, 8 ml. of an anhydrous methanol solution of 0.91 g. of methylamine was added, and the tube was sealed and heated on a steam-bath for 2% hours. The resulting solution was evaporated to dryness underreduced pressure and the residue was evaporated to dryness under'reduced pressure with aqueous ethanol and then with absolute ethanol. A solution of the residue in 100 ml. of methanol and 20 ml. of water was stirred for 1 hour with 25 g. of Amberlite IRA-400 (OH) resin, and the filtered solution was evaporated to residue under reduced pressure. 'Crystallization of the residue from ethyl acetate gave 0.641 g. of colorless crystals, M. P. 133-136" C. Evaporation under reduced pressure of the mother liquor and trituration of the. residue with ether gave an additional 0.947 g. of product. The combined crops were recrystallized several times from absolute ethanol to give o-diheptylamino-9--(3-amino-3- deoxy-fi-D ribofuranosyDpurine as colorless crystals, M P. 137-438"; [u] -36.9 (ethanol);

ne 271 mu (519,700); new 278 m (620,000 the 276 my (610,200)

EXAMPLE 24 6 mercarpto-9-(2,S-di-O-benz0yli-pltthalimido-3-de0xy- {B-D-ribofuranosyl) purine A mixture of 1.000 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido-3-deoxy-fl-D-ribofuranosyl)purine (containing one-third mole of ethyl acetate), 0.129 g. of thiourea and 25 ml. of absolute ethanol was heated to boiling to give a colorless solution. On cooling a yellow precipitate was deposited which was gradually replaced by nearly colorless crystals. After one week at room temperature the product was removed by filtration. washed with absolute ethanol and ether, and dried at 100 C. The yield of 6-mercapto-9-(2,5-di-O-benzoyl- 3-phthalirnido-3-deoxy-,6-D-ribofuranosyl)purine as nearly colorless crystals, M. P. 233238 C. (the melting point was dependent on the rate of heating), was 0.817 g.;

[a] 1O5.0 (pyridine);

X9 15 .222 mu (68,800), 322.5 mg (625,400); Aggtf 220 m (667,200), 321 m (621,400); $3.5 217.5 mg (654,900), 312 m (622,600)

13 EXAMPLE '25 2 chloro 6 dipropylamino 9 (3 amino 3 deoxy- D-ribofuranosyl)purine A mixture of 5.93 g. of 2,6-dichloro-9-(2,5-di-O- benzoyl 3 phthalirnido 3 deoxy D ribofuranosyl) purine, 12.4 ml. of dipropylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steambath for 2 hours. The cooled tube was opened, 4.5 ml. of butylamine was added, and the tube was sealed and heated on a'steambath for 2 hours. The resulting solution was evaporated to dryness under reduced pressure and the residue was evaporated to dryness under reduced pressure with aqueous ethanol and then absolute ethanol. A solution of the gummy residue in 100 ml. of 3:1 methanol: water was stirred for 1 hour with 25 g. of Amberlite IRA- 400 (OH) resin, and the resin was removed by filtration and washed well with hot methanol. The combined filtrate and washings were evaporated to drynessunder reduced pressure, and the residue was evaporated to dryness under reduced pressure several times with absolute ethanol. Crystallization of the glass from 2:1 methanol: water gave 1.840 g. of colorless crystals, M. P. 93- 103 C. Recrystallization from ethyl acetate gave 0.061 g. of 2-chloro-6-dipropylamino-9-(3-amino-3-deoxy-D- ribofuranosyDpurine as colorless crystals, M. P. 161- 164" C. Further chilling of the aqueous methanolic mother liquor gave, in two crops, 1.562 g. of crude product, M. P. 138-158 C. Several recrystallizations from ethyl acetate gave pure product as lustrous colorless plates, M. P. 164.5-165.5 C.; [a] 23.6 (ethanol);

use 219 my (618,900), 283 111,. (620,400 A332? 219 mp. (620,300), 281 my (1,600); 1" |:i:x -5 mp. (50,400), 282.5 m (621,000)

EXAMPLE 26 6-m ethylmercapto-chloromercuripurine A hot solution of 6.502 g. of mercuric chloride in 25 ml. of ethanol was added to a hot solution of 3.979 g. of 6- methyhnercaptopurine in 100 ml. of water and 23.94 ml.

of 1 N sodium hydroxide to produce a colorless precipitate. To the hot suspension 12.00 g. of diatomaceous earth was added, the suspension was chilled and filtered, and the precipitate was washed with water and dried at 100 C. The precipitate, 21.69 g., contained 9.69 g. of 6-methylmercapto-chloromercuripurine.

EXAMPLE 27 6 methylmercapto 9 (2,5 di O benzoyl 3 phthalimid0-3-de0xy-D-ribofuran0syl purine To a stirred, refluxing suspension of 4.34 g. of 6- methylmercapto-chloromercuripurine and 5.38 g. of diatomaceous earth in 165 ml. of xylene, freed from traces of water by refluxing into a moisture point receiver, a hot solution of 5.06 g. of 2,5-di-O-benzoyl-3-phthalimido-3- deoxy-{i-D-ribofuranosyl chloride in 50 ml. of xylene was added. The resulting colorless suspension was stirred and refluxed for 6 hours, filtered while hot, and the precipitate was washed with hot chloroform. The combined filtrate and wash were washed with two 25-ml. portions of 30% potassium iodide and two 50-ml. portions of water. The organic solution was evaporated under reduced pressure at 70 C. to yield 6.580 g. of crude 6-methylmercapto-9- (2,5 di O benzoyl 3 phthalirnido 3 deoxy D- ribofuranosyDpurine as a nearly colorless glass. Crystallization from absolute ethanol-chloroform gave 4.76 g. of colorless crystals, M. P. 193-196" C. Several recrystallizations from absolute ethanol-chloroform gave colorless crystals, M. P. 195.5196.5 C. (partially melts at 157- 159 C. and resolidifies); [a] 88.4 (chloroform);

max.

(e17,800), 294 mp (e17,700)

product from crystallizing).

14' EXAMPLE 2:;

A solution of 1.000 g. of 6-methylmercapto-9-(2,5-di- O benzoyl 3 phthalirnido 3 deoxy D ribofuranosyl)purine in 100 ml. of methyl Cellosolve was stirred With 3 tspns. of Raney nickel while heating on a steam-bath for 45 minutes. While hot, the suspension was filtered through diatomaceous earth and the precipitate was washed well with hot methyl Cellosolve. The combined filtrate and Wash were evaporated under reduced pressure to yield 0.458 g. of a pale yellow glass. Crystallization from ethyl acetate-heptane gave 0.210 g. of 9 (2,5 di O benzoyl 3 phthalirnido 3 deoxy- D-ribofuranosyl)purine, M. P. 115-119 C. Recrystallization from ethyl acetate-hexane and then from 3A alcohol gave the hydrate as colorless crystals, M. P. 117.5- 122 C.; [a] 61.7 (chloroform);

ima 223.5 m (664,100), 306 m broad (53,180); its," H01 265 m (E8,800); my 221.5 mp. (666,500), 262.5 m (e9,500), 300 m broad (62,280); mgr 282.5 Ill 1 (3,940 262.5 m 69,500

EXAMPLE 29 6 decylamine 9 (3 amino 3 deoxy ,B

ribofuranosyl) purine A mixture of 2.00 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3-phthalimido 3 deoxy-B-D-ribofuranosyl)purine (containing one third mole of ethyl acetate), 3.63 g. of decylamine and ml. of anhydrous methanol was refluxed for 3 /2 hours. The resulting solution was cooled to room temperature, diluted with 10 ml. of water and stirred with 10 g. of Amberlite IRA-400 (OH) resin for 1 hour (additional methanol was added to prevent the The filtered solution was evaporated under reduced pressure and the residue was distilled several times with water under reduced pressure. The viscous residue was treated with methanol and filtered. The filtrate was evaporated to dryness under reduced pressure and the residue was refluxed with ether and filtered to yield 0.383 g. of 6-decylamino-9-(3-amino-3-deoxy-B-D- ribofuranosyl) purine as colorless crystals, M. P. 137141 C. Several recrystallizations from absolute ethanol (with the aid of activated charcoal) gave colorless crystals.

M. P. 138139 C.; [a] --40.0 (ethanol);

ma 263 my (61 268 (618900 43}? 268.5 mu (6 EXAMPLE 30 A mixture of 6.50 g. of 6-chloro-9-(2,5-di-O-benzoyl-3- phthalimido-3-deoxy-fl-D-ribofuranosyl)purine (containing one-third mole of ethyl acetate), 7.3 g. of diallylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 3 /4 hours. The cooled tube was opened, 5 ml. of butylaminewas added, and the tube was resealed and heated on a steam-bath for 2 hours. The resulting solution was evaporated under reduced pressure to a brown syrup which was evaporated several times under reduced pressure with aqueous ethanol. A solution of the residual brown syrup in 75 ml. of ethanol and 25 ml. of water was stirred for 1 hour with 20 g. of Amberlite IRA-400 (OH) resin. The filtered solution was evaporated under reduced pressure. The residual crystals and gum were triturated with ether and then diluted with ethyl acetate. Filtration gave 1.114 g. of 6-diallylamino-9-(3-amino-3-deoxy-[3-D-ribofuranosyl)purine as colorless crystals, M. P. 158161 C. The mother liquor deposited an additional 0.217 g. of product, M. P. 154-159? C. Recrystallization from ethanol m.

15 ethyl acetate and ethanol-ethyl acetate gave colorless crystals, M. P. 16l163.5 C.; [di 43.1 (methanol);

in: H01 269 mu (d ans); new 276 III/.1 (21,800 x9 3 MB 277 mu M1300) EXAMPLE 31 6 (4 morpholinyl) 9 (3-[0-(4-m0rph0linylcarb0nyl) benzamid -3 -d eoxy-fi-D-ri bofuranosyl purine A mixture of 6.68 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3 -phthalirnido-3-deoxy-B-D-ribofuranosyl purine (containing one-half mole of ethyl acetate), 11.3 ml. of morpholine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 6 hours. The resulting brown solution was evaporated under reduced pressure to a residual glass which was twice dissolved in aqueous ethanol and evaporated to dryness under reduced pressure. A solution of the residue in 75 ml. of 2:1 methanolzwater was stirred for 1 hour with 15 g. of Amberlite IRA-400 (OH) resin, filtered, and stirred for one-half hour with 15 g. of resin. The filtered solution was evaporated to dryness under reduced pressure and the residue was twice evaporated to dryness under reduced pressure to yield 3.53 g. of 6-(4-rnorpholinyl)-9- (3- [o- (4-morpholinylcarbonyl) benzarnido] -3-deoxy-fi-D ribofuranosyhpurine as a light tan glass; [OL]D24 l6.6 (ethanol);

EXAMPLE 32 A mixture .of 4.00 g. of 6-chloro-9-(2,5-di-O-benzoyl- 3 phthalimido -3- deoxy-fi-D-ribofuranosyl)purine (containing one-third mole of ethyl acetate), 4 ml. of butylamine and 100 ml. of anhydrous methanol was refluxed for 3 hours. The resulting solution was diluted with 20 ml. of water and stirred for 1 hour with 20 g. of Amberlite IRA-400 (OH) resin. The filtered solution was evaporated to dryness under reduced pressure. The residual solid was recrystallized from absolute ethanol to yield, after Washing with ether, 0.202 g.v of 6-butylamino- 9-(3-amino-3-deoxy-lS-D-ribofuranosyl)purine as colorless crystals, M. P. 171172 C. Concentration of the mother liquor gave, in three crops, an additional 045 3 g. of product. Recrystallization from absolute ethanol, ethyl acetate and methanol gave the product as colorless crystals containing one-fourth mole of water; [M 43.7 (ethanol);

Mil 262 mp. 619,200); x 33 use 269 my (617,600

EXAMPLE 33 6-cycl0hexylamin0-9- (3-amino-3-de0xy-fi-D- ribofuranosyl purine A mixture of 6.504 g. of 6-chloro-9-(2,5-di-O-benzoyl 3 phthalimido -3- deoxy-p-D-ribofuranosyl) purine (con taining one-third mole of ethyl acetate), 11.5 ml. of cyclohexylamine and 50 ml. of anhydrous methanol in a sealed tube was heated on a steam-bath for 2 /3 hours. The resulting solution was evaporated to dryness under reduced pressure and the residue Was evaporated to dryness under reduced pressure several times with aqueous ethanol and then with absolute ethanol. A solution of the residual brown glass in 125 ml. of 4:1 methanolzwater was stirred for 1 hour with 20 g. of Amberlite IRA- 400 (OH) resin. The filtered solution was evaporated to dryness under reduced pressure to yield 5.74 g. of residual tan glass. A mixture of 5.67 g. of the tan glass, 4.5 ml. of butylamine and 50 ml. of anhydrousmethanol in a sealed tube was heated on a steam-bath for 2 hours. The resulting amber solution was evaporated to'dryness under reduced pressure to a tan semi-solid residue. A solution of the residue in 75 ml. of 3:1 ethanolzwater was percolated through a column of 25 g. of Amberlite IRC-50 (H) resin and the column was washed with 938 mlrof 3:1 ethanolzwater, the final percolate having a negligible absorption of 269 m The column was then washed with 606 ml. of 3:1 ethanolzZ'N ammonium hydroxide, the final percolate having negligible absorption at 269 mu. The ethanol:2 N ammonium hydroxide percolate was evaporated under reduced pressure to yield 1.880 g. of a nearly colorless glass. The glass was partitioned on 240 g. of diatomaceous earth in the system 6:122 ethyl acetate:heptane:water and the column was eluted with upper phase. 'The eluate was measured spectrophotometrically at 269 I'll/L and two peaks were observed. The portions of eluate containing the second absorbing peak were combined and evaporated to dryness under reduced pressure to yield 1.390 g. of 6-cyclohexylamino-9'-(3-amino-3-deoxy-;8-D-ribofuranosyl)purine as a colorless glass; [@15 42.5 (ethanol);

ne 263 mu (19, 0 270 mil (617,300); k ts mu.

EXAMPLE 34 6 chloral-9'- (2,3-di-O-benzoy l-5 -phthalimido-5 -de0xy- B-D-ribofuranosyl purine ethanol max.

. gum was dissolved in 20 cc. of anhydrous xylene and was added to a suspension of 3.55 g. of 6-chloropurine mercuric chloride reaction product and 2.12 g. of diatomaceous earth in 300 cc. of anhydrous xylene. The mixture was stirred and refluxed for three hours and was then filtered while still hot. The precipitate was washed with a little chloroform and the washings were added to the original filtrate. This solution was evaporated under reduced pressure and the residue was taken up in a mixture of 20 cc. of a 30% aqueous potassium iodide solution and cc. of chloroform. The layers were separated and the organic phase was washed with another 15 cc. of the potassium iodide solution and then with 20 cc. of water. The chloroform solution was dried and partially decolorized with magnesium sulfate and charcoal and was then filtered. The filtrate was evaporated under reduced pressure andtheresidue was dried in a desiccator under reducedpressure to attord 5.45 g.'of yellow glass. This was dissolved in 20 cc. of benzene and added to the top of a column containing g. of acid washed alumina and benzene (column dimensions 3 x 17 cm.). The column was washed with :anhydrousbenzene and the washings were discarded. Elution was then carried out with a mixture of 20% ethyl acetate in benzene and a total of ten 100-cc. fractions were collected. These fractions were pooled and'evaporated to afford 3.55 g.-of 6-chloro-9- (2,3-di-O-benzoyl 5 phthalimido 5 deoxy-B-D-ribofuranosyl)purine as a colorless, fiufied glass. The substance is soluble in chloroform, ethyl acetate and benzene. It is somewhat soluble in ether or ethanol and is insoluble in water.

EXAMPLE 35 6-am ino-9- (5 -amin0-5 -d eoxy-B-D-ri bofuranosyl purine A mixture of 1 g. of 6-chloro-9-(2,3-diO-beuzoyl-5- phthalimido-S-deoxy-fi-D-ribofuranosyl)purine and 30 cc. of methanolic ammonia (saturated at 0 C.) was heated in a stainless steel bomb on a steam-bath for 50 minutes with occasional shaking. The bomb was allowed to cool and was opened and there was added 10 cc. of a solution of 0.067 mole of methylamine in methanol. The bomb was closed and was again heated on the steam-bath for 1 hour. It was allowed to cool and the contents were collected and evaporated under reduced pressure. The residue was mixed with water and with ether. The layers were separated and the water phase was extracted with another portion of ether. The ether fractions were discarded and the dark brown water solution was filtered through a layer of activated charcoal. The filtrate was added to the top of a column containing Amberlite IRC-SO (H) resin. The column was washed with 1 liter of water and the washings were discarded. The column was then washed with 250 cc. of 2 N ammonium hydroxide solution followed by 250 cc. of water. These two fractions were combined and evaporated under reduced pressure at a bath temperature below 45 C. The residue (300 mg.) was dissolved in 2 cc. of the lower phase of a butanol-water mixture and the solution was mixed intimately with 4 g. of diatomaceous earth. This mixture was added to the top of a column of 60 cc. of diatomaceous earth which had been well mixed with 30 cc. of the aqueous phase of the butanol-water mixture. The column was developed with the upper phase of this solvent system and the efiluent was checked with a recording ultraviolet spectrophotometer set at 260 mu. This showed that adenosine-like material started to be washed ofi the column after 100 cc. of the solvent had run through. Fractions containing this material (about 90 cc.) were pooled and evaporated to yield 200 mg. of amorphous material. This was purified by solution in methanol and filtration through a layer of activated charcoal. The filtrate was concentrated to a small volume and ethyl acetate was added at the boiling point to give 5 cc. of solution. Ether was added until the solution became cloudy and the solid which precipitated out on standing was collected and was washed with more ether. A second portion of solid could be obtained by evaporating the filtrate to a small volume and adding more ether. The combined solids were dried under reduced pressure to aitord 0.164 g. of 6-amino-9-(S-amino-S-deoxy-fl-D- ribofuranosyDpurine as a white amorphous solid,

EXAMPLE 36 6-chl0r0-9-(5-amin0-5-de0xy-{3-D-ribofuran0syl) purine To a solution of 1.0 g. of 6-chloro-9-(2,3-di-O-benzoyl- 5-phthalimido-5-deoxy-B-D-ribofuranosyl)purine in 6 cc. of hot n-propanol was added 0.6 cc. of hydrazine hydrate and the mixture was heated on a steam-bath for about 5 minutes. The dark suspension was filtered and the precipitate was washed with a little methanol. The filtrate was evaporated under reduced pressure and the residue was taken up in water and the filtered solution was passed into a column of Amberlite IRC-SO (H) resin. The column was washed with 1 liter of water and the washings were discarded. Elution of the column with 2 N ammonium hydroxide (500 cc.) afforded a light red solution which was evaporated under reduced pressure at a bath temperature of 45 C. The dried residue was a pink powder which weighed 0.16 g. This was dissolved in 1.5 cc. of the upper phase and 1.5 cc. of the lower phase of a butanol-water mixture and the solution was mixed with 3 g. of diatomaceous earth. This was packed on the top of a column consisting of 60 g. of diatomaceous earth and 30 cc. of the lower phase of the butanol-water system. The column was washed with the upper phase of this solvent system and the effiuent was allowed to pass through a recording ultraviolet spectrophotometer which had been set at 264 m Material showing absorption at this wave length was eluted after 100 cc. of solvent had passed through the column. Fractions containing this material were pooled (95 cc.) and evaporated under reduced pressure at 45 C. The residue (0.07 g.) was taken up in stance is soluble in ethanol, isopropanol and water and is insoluble in ether and hexane.

EXAMPLE 37 9 (2,3 di O benzoyl 5 phthalimido 5 'deoxy B D ribofuran osyl purine A solution of 0.9 g. of 6-chloro-9-(2,3-di-O-benzoyl-5- phthalimido-S-deoxy-fi-D-ribofuranosyl)purine in 15 cc. of methyl Cellosolve was added to 0.12 g. of magnesium oxide and 0.1 g. of 10% palladium on charcoal catalyst. The stirred mixture was reduced with hydrogen under atmospheric pressure. When the hydrogen uptake slowed down, the mixture was filtered and another batch of magnesium oxide and of the palladium catalyst was added. This was repeated once more. When the calculated amount of hydrogen had been taken up, the reduction was stopped and the mixture was filtered. The filtrate was evaporated under reduced pressure and the residue was dissolved in cc. of methylene chloride. This solution was washed with several small portions of water and was then dried over magnesium sulfate, filtered and freed from solvent under reduced pressure. The residue (0.82 g.) was crystallized from a mixture of ether and methylene chloride to afford 0.542 g. of 9-(2,3-di-O- benzoyl 5 phthalimido 5 deoxy ,8 D ribofuranosy1)purine, M. P. 153-155" C. The compound is soluble in methylene chloride, ethyl acetate and ethanol but is insoluble in water or in hexane.

EXAMPLE 38 9-(S-amino-5-deoxy-,B-D-rib0;furanosyl) purine tated out as the reaction proceeded. After the 5 minute heating period, the mixture was allowed to cool and was filtered. The precipitate was washed with a little methanol and was discarded. The washings and filtrate were combined and evaporated to a volume of about 20 cc. and this solution was added to the top of a column of Amberlite IRC-SO (H) resin. The column was washed with 1 liter of water and the washings were discarded. The column was then washed with 250 cc. of 2 N aqueous ammonium hydroxide and with 150 cc. of water. These fractions were combined and evaporated under reduced pressure. The residue (0.19 g.) was dissolved in 2 cc. of the lower phase and 2 cc. of the upper phase of a butanol-water mixture and the solution was mixed inti mately with 4 g. of diatomaceous earth. This was added to a column prepared from 60 g. of diatomaceous earth which had been mixed with 30 cc. of the lower phase of the butanol-water mixture. The dimensions of the completed column were 54 cm. x 2 cm. The column was washed with the upper phase of the solvent system and the effluent was allowed to pass through a recording ultraviolet spectrophotometer which had been set at 260 m After some cc. of solvent had passed through the column, material which absorbed at this wave length started to come off. All fractions containing this substance were collected, pooled and evaporated under reduced pressure to alf-ord 0.1 g. of glass. This was dissolved in methanol passed through a layer of charcoal and the filtrate was once more evaporated. This residue was crystallized from a mixture of ethyl acetate and ether. There was obtained 0.044 g. of 9-(5-amino-5- deoxy-fi-D-ribofuranosyl) purine which decomposed slow- [9 1y between 148-'-155 C. (depending on the rate of heatlng);

Afliif 263 m (66,640)

The compound is soluble in ethanol and Water. It is somewhat soluble in ethyl acetate and insoluble in ether.

EXAMPLE 39 Ethyl 2 acetamido 2 deoxy 3,5,6 ri O benzoyl oz D glucothiofuranoside In 3 cc. of reagent pyridine there was dissolved 0.50 g. of ethyl 2-acetamido-2-deo-xy-u-D-gluco-thiofuranoside and the solution was cooled to -5 C. After the addition of 0.73 cc. of benzoyl chloride the reaction mixture was allowed to remain at 5 C., protected from atmospheric moisture, for 3 days. The dark solution was poured on 50 cc. of ice-water and Was extracted with chloroform. The chloroform was washed with excess A suspension of 6.9 g. of ethyl 2-acetarnido-2-deoxy- 3,5,6 tri O benzoyl on D glucothiofuranoside and 20.0 g. of mercuric oxide in 69.0 cc. of acetone and 6.9 cc. of water was prepared. The mixture was magnetically stirred while a solution of 18.6 g. of mercuric chloride was added dropwise over 2 hours. After stirring for 48 hours at room temperature the mercuric oxide was removed by filtration through diatornaceous earth and the filtrate was evaporated to dryness under reduced pressure leaving a gum. The gum was dissolved in 15 cc. of water and extracted twice with cc. portions of chloroform. The chloroform layer was separated and washed with 10 cc. of 30% potassium iodide and two cc. portions of water. After drying over magnesium sulfate the chloroform solution was evaporated to dryness under reduced pressure leaving 6.0 g. of 2-acetamido-2-deoxy-3,5,6-tri-O- benzoyl-D-glucofuranose as a yellow gum which gave a positive Benedict test and showed 76.5% free sugar by the Hanes modification of the Hegadorn-Iensen procedure.

EXAMPLE 41 1 O acetyl 2 acetamido -2 deoxy 3,5,6 tri O benzoyl D glucofumnose To a solution of 0.5 g. of 2-acetamido-2-deoxy-3,5,6- tri-O-benzoyl-D-glucofuranose in 5 cc. of pyridine was added 5 cc. of acetic anhydride and the solution was allowed to remain at room temperature, protected from atmospheric moisture, for 18 hours. After pouring on 50 cc. of ice-water the mixture was extracted several times with chloroform. The chloroform extracts were combined and washed with excess saturated sodium bicarbonate and then with water. After drying over magnesium sulfate the chloroform solution was evaporated to dryness under reduced pressure leaving a dark gum which was clarified by treating with activated charcoal in absolute ether. On reevaporation 450 mg. of l-O-acetyl-Z- acetamido 2 deoxy 3,5,6 tri O benzoyl D glucofuranose was obtained as a light yellow gum.

EXAMPLE 42 6-chl0r0-9-(2-acetamido-2-deoxy-3,5,6-tri-O-benzoyl-$- D-glucofuranosyl) purine In 25 cc. anhydrous ether, saturated at .0 C. with hydrogen chloride, 2.0 g. of l-O-acetyl-Z-acetamido-Z- 20 deoxy-3,5,6-tri-O-benzoyl-D-glucofuranose was dissolved. Then 2.0 cc. of acetyl chloride was added. The resulting solution was kept at 5 C., protected from atmospheric moisture, for 3 days and then was evaporated to dryness under reduced pressure at a water bath temperature of 40-45 C. Reagent benzene was added and evaporation was repeated leaving a light pink solid, M. P. 78-82 C., dec. In 250 cc. of xylene there was suspended 2.7 g. of 6-chloropurine mercuric chloride reaction product and there was removed by distillation about 80 cc. of xylene. To the mixture with magnetic slurring was added the above light pink solid and the whole reaction was stirred for 3 hours in refluxing xylene. After filtration the filtrate on evaporation to dryness under reduced pressure gave a gum which was redissolved in chloroform and washed with 30% potassium iodide. After one water wash the chloroform solution was evaporated to dryness leaving 2.0 g. of 6-chloro-9-(2-acetamido-2-deoxy-3,5,6- tri-O-benzoyl-p-D-glucofuranosyl) purine as a dark brown gum.

EXAMPLE 43 6-dimethylamino-9- (Z-acetamido-Z-deoxy-fl-D- glzzcofuranosyl) purine A solution of 2.0 g. of 6-chloro-9-(Z-acetarnido-fideoxy-3,5,6-tri-O-benzoyl-fi-D-glucofuranosyl)purine, 3 cc. of dimethylamine and 25 ml. of reagent methanol in a steel autoclave was heated for 2 hours on a steam-bath, cooled and the contents evaporated to dryness under reduced pressure. The resulting gum was dissolved in 25 cc. of water and impurities were removed by filtration and extraction of the filtrate with ether. On evaporation of the aqueous solution to dryness under reduced pressure there remained 0.8 g. of 6-dimethylamino-9-(3- acetamido 3 deoxy-B-D-glucofuranosyl)purine, U. V. maxima: 268 m;t(pH1), 278 III/.0 (pl-l7), 278 m (pHl4).

EXAMPLE 44 1 ,2,4 ,6 -tetra-0-acetyl-3 -acetamido-3-de0xy-D- allopyranoside To a solution of 25 g. of methyl 2,4,6-tri-O-acetyl-3- acetamido-3-deoxy-a-D-allopyranoside and 250 cc. of acetic anhydride cooled in an ice-bath was added 5 cc. of concentrated sulfuric acid dropwise with shaking. The stoppered solution was allowed to stand at room temperature for 7 days. The reaction mixture was poured into approximately 1300 cc. of ice-water and stirred for approximately 30 minutes to decompose the acetic anhydride. The solution was saturated with sodium chloride and extracted with three 200 cc. portions of chloroform. The combined extracts were dried with anhydrous magnesium sulfate, filtered, and the filtrate was evaporated to dryness under reduced pressure. The residue was evaporated three times with toluene, leaving 20.8 g. of 1,2,4,6-tetra-O-acetyl-3-acetamido 3 deoxy D allopyranoside as a buff colored syrup.

EXAMPLE 45 6-chloro-9-(2,4,6-tri-0-acetyl-3-acetamid0-3-de0xy-B- D-allopyranosyl purine A mixture of 19.7 g. of 6-chloropurine mercuric chloride reaction product, 17.8 g. of diatomaceous earth, 20.7 g. of 3-amino-3-deoxy-D-allopyranoside pentaacetate and 750 cc. of ethylene dichloride was freed from traces of water by distillation of cc. of solvent. To the somewhat cooled, stirred mixture was added a solution of 6.4 cc. of titanium tetrachloride in 100 cc. of ethylene dichloride over a period of about 2 minutes. The mixture was refluxed and stirred for 20 hours, then diluted with 400 cc. of 1 N hydrochloric acid and stirred for 1 hour without further heating. The mixture was filtered and the filter cake washed with hot chloroform. The organic layer was separated from the combined filtrate and washings, then evaporated to dryness under reduced pressure. A solution of the residue in 100 cc. of chloroform was washed with 100 cc. of 30% aqueous potassium iodide followed by water. After being dried with anhydrous magnesium sulfate, the solution was evaporated to dryness under reduced pressure leaving 5.5 g. of 6- chloro-9-(2,4,6-tri-O-acetyl 3 acetarnido 3 deoxy-fi- D-allopyranosyl)purine as a glass.

EXAMPLE 46 6-dz'methyIamino-9- (3-acetamido-3-deoxy-fi-D- allopyranosyl) purine 1. A method of preparing aminodeoxyglycosidopurines of the formula:

278 mp 45,600); A253 Br I CH z-L LN N I wherein R and R are members of the group consisting of halogen, hydrogen, alkyl, hydroxyl, alkoxy, aralkyloxy, mercapto, alkylmercapto, amino, alkylamino, mononuclear arylamino, aralkylamino, heterocyclicalkylamino, dialkylamino, pentamethyleneimino, oxapentamethyleneimino, dialkenylamino and cycloalkylamino radicals, and wherein X is an aminodeoxyglycosido radical, the amino group of which is substituted with a member of the group consisting of hydrogen, acyl and aroyl radicals, and the exocyclic oxygen atoms of which are substituted with a member of the group consisting of hydrogen, acyl and aroyl radicals, which comprises: reacting an aminodeoxyglycosidopurine of the above formula which contains at least one replaceable group in the R and R positions selected from the group consisting of halogen and alkoxy with a compound of the group consisting of ammonia, aliphatic, primary and secondary amines, aromatic amines, aralkylamines, heterocyclicalkylamines, pentamethyleneimines, oxapentamethyleneimines, dialkenylamines, cycloalkylamines, alkoxides, aralkoxides, thioalkoxides, thiourea, and inorganic bases so as to replace at least one R group and whereby the acyl and aroyl groups on the exocyclic oxygen atoms are removed.

2. A method as in claim 1 in which the replacement reaction is carried out in the presence of a hydroxylated organic solvent at a temperature of from 20 to 200 C.

3. A process as in claim 1 in which the reacting aminodeoxyglycosidopurine is 6-chloro-9-(2,5-di-O-benzoyl-3- phthalimido-3-deoxy-B-D-ribofuranosyl)purine.

4. A process as in claim 1 in which the reacting aminodeoxyglcosidopurine is 6-chloro-9-(2,5-di-O-benzoy1-3- acetamido-3-deoxy-D-ribofuranosyl purine.

5. A process as in claim 1 in which the reacting aminodeoxyglycosidopurine is 2,6-dichloro-9-(2,5-di-O-benzoyl- 3-phthalimido-3-deoxy-D-ribofuranosy1)purine.

6. A process as in claim 1 in which the reacting aminodeoxyglycosidopurine is 6-methoxy-9-(3-phthalimido-3- deoxy-p-D-ribofuranosyl)purine.

7. A process as in claim 1 in which the reacting aminodeoxyglycosidopurine is 6-chloro-9-(2,3 di O- benzoyl-S -phthalimido-5-de oxy-p-D-ribofuranosyl) purine.

8. A process as in claim 1 in which the reacting aminodeoxyglycosidopurine is 6-chloro-9-(2,4,6-tri-O- acetyl-3-acetamido-3-deoxy-p-D-allopyranosyl)purine.

9. A process as in claim 1 in which the reactant is ammoma.

10. A process as in claim 1 in which the reactant is a monosubstituted aliphatic amine.

11. A process as in claim 1 in which the amine is methylamine.

12. A process as in claim 1 in which the amine is a disubstituted aliphatic amine.

13. A process as in claim 12 in which the amine is dimethylamine.

14. A process as in claim 12 in which the amine is dipropylamine.

15. A process as in claim 1 in which the reactant is an alkoxide.

16. A process as in claim 15 in which the alkoxide is sodium methoxide.

17. A process as in claim 1 in which the reactant is an aralkoxide.

18. A process as in claim 1 in which the reactant is thiourea.

19. A process as in claim 1 in which the reactant is an inorganic base.

20. In a process of preparing aminodeoxyglycosidopurines, the step which comprises reacting an aminodeoxyglycosidopurine substituted in the 2- and 6-positions by at least one replaceable group selected from the group consisting of halogen and alkoxy, the amino group of which is substituted with a phthaloyl radical and the exocyclic oxygen atoms of which are substituted with a member of the group consisting of acyl and aroyl radicals, with a primary amine in the presence of a hydroxylated organic solvent whereby the acyl and aroyl radicals on the exocyclic oxygen atoms are removed.

21. A process according to claim 20in which the amine is a primary aliphatic amine.

22. A process according to claim 20 in which the solvent is methanol.

23. In a process of preparing aminodeoxyglycosidopurines, the step which comprises reacting an aminodeoxyglycosidopurine substituted in the 2- and 6-positions by at least one replaceable group selected from the group consisting of halogen and alkoxy, the amino group of the aminodeoxyglycosidopurine being substituted with a member of the group consisting of hydrogen, acyl and aroyl radicals and the exocyclic oxygen atoms of which are substituted with a member of the group consisting of acyl an aroyl radicals, with a member of the group consisting of primary and secondary amines in the presence of a hydroxylated organic solvent where-* by the acyl and aroyl groups on the exocyclic oxygen atoms are removed.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A METHOD OF PREPARING AMINODEOXYGLOCISIDOPUTINES OF THE FORMULA: 